Demi Injured in San Antonio Concert

While performing in San Antonio, Texas Demi Lovato sustained an injury that left her in an arm sling.&#160;&quot;Welp. Looks like I won&#39;t be playing guitar, piano OR drums tonight. San Antonio... Why did you have to go and make me fall so hard for you?!! &quot; the former Disney star wrote on Facebook with a picture of her injury.&#160; http://goo.gl/E4DzAh
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